What Is Jade? Learn about the uses of jade. It has been used to make ornaments and tools for thousands of years..
Synthetic Diamonds
Synthetic Diamonds: Large, nearly-flawless diamonds are now possible with chemical vapor deposition.
Amazing Agate Photos
Beautiful Photos of Agates: A gallery of spectacular agate photos and descriptions prepared by Professor Richard Weston.
Herkimer "Diamonds"
Herkimer "Diamonds": These doubly-terminated quartz crystals have been given the popular name "Herkimer Diamonds."
Diamond: The Mineral
Diamond: Learn about the properties of diamonds and their many uses. Diamonds are much more than jewelry!
Ametrine Gemstones
Ametrine The Bicolor Amethyst Ametrine is the name used when a single crystal of quartz has zones of gemstone quality amethyst (purple) and gemstone quality citrine (golden) in contact with one another.
Corundum
Uses of Corundum: Corundum is a very interesting mineral. It is an exceptionally hard aluminum oxide that forms in igneous and metamorphic rocks.
Uses of Gold
The Many Uses of Gold: Learn how the unique properties of gold make it extremely suited for a large number of industrial uses.
Quartz
Uses of Quartz: The most abundant mineral found at Earth's surface and its unique properties make it one of the most useful natural substances.
